His argument's getting some attention, but not what it deserves. Hansen had his 1988 moment in front of Congress saying that global warming had already arrived, and Michael should have the same chance to say the same thing about tying specific weather events to climate change.
Of course there's the tiny issue of whether Michael's correct, something I can't really judge. The same question was in place when Hansen testified to Congress, though. Just because it's not yet known as a certainty isn't justification for downplaying it - let's get the word out, with uncertainties expressed.
It should also be noted that specific physical events (not just statistical changes) that we can tie to climate change right now also include sea level rise and ocean acidification, but they're quite as dramatic as Russia on fire.
UPDATE: Michael Tobis backs off slightly, and finds Pat Michaels making his first worthwhile contribution to science in years. While the Russian heating may still be unprecedented, the case for being it nearly impossible without climate change is less strong now.